Direct current traction power supply system practical training platform and method

Abstract

The application discloses a DC traction power supply system practical training platform and method, the practical training platform includes industrial computer, analog signal generator, communication management machine and control monitor; the industrial computer is connected with the analog signal generator, communication management machine and control monitor; the analog signal generator is connected with the protection isolated transmitter of each device in the DC traction power supply system; the communication management machine is connected with the relay protection device of each device in the DC traction power supply system; the control monitor is connected with the relay protection device or circuit breaker of each device in the DC traction power supply system. The application can display the protection working principle of the DC traction power supply system, simulate faults, handle faults and analyze faults, so that students can better master the protection working principle of the DC traction power supply system and fault handling and analysis.

Description

Technical Field

[0001] This invention belongs to the field of electrical training equipment technology, and in particular relates to a DC traction power supply system training platform and method. Background Technology

[0002] The DC traction power supply system is one of the most important components of the rail transit traction power supply system. To ensure normal train operation and the safety of equipment and personnel in case of malfunctions, maintenance personnel need to master and be trained in the working principles and protection functions of the DC traction power supply system. Currently, there are two methods for training maintenance personnel: one is to use courseware and models for teaching. This method cannot provide a realistic and intuitive understanding of the working principles of the DC traction power supply system, and the lack of knowledge and practical skills among trainees poses a significant safety hazard. The other method is to use 1:1 scale equipment for teaching and training. This method only provides a visual understanding and operation of a single unit; it cannot be powered on, so it cannot explain the protection functions and principles of the DC traction power supply system, let alone handle and analyze faults in the DC traction power supply system.

[0003] In summary, existing teaching methods are insufficient to provide an understanding of the protection functions and principles of DC traction power supply systems. Most teaching methods rely on theoretical instruction, which cannot simulate faults or guide students in fault handling and analysis. Summary of the Invention

[0004] The purpose of this invention is to provide a training platform and method for DC traction power supply systems, so as to solve the problem that traditional teaching methods cannot understand the protection functions and principles of DC traction power supply systems, let alone perform fault handling and analysis of DC traction power supply systems.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution: a DC traction power supply system training platform, comprising an industrial control computer, an analog signal generator, a communication management unit, and a control monitor; the industrial control computer is connected to the analog signal generator, the communication management unit, and the control monitor; the analog signal generator is connected to the protection isolation transmitters of each device in the DC traction power supply system; the communication management unit is connected to the relay protection devices of each device in the DC traction power supply system; and the control monitor is connected to the relay protection devices or circuit breakers of each device in the DC traction power supply system.

[0006] The industrial control computer is used to generate corresponding control signals according to different fault simulation instructions; and to analyze the fault data transmitted by the communication management unit, and to give corresponding prompts and display fault waveforms based on the analysis results.

[0007] The analog signal generator is used to provide fault simulation signals to each device in the DC traction power supply system under the control of the industrial control computer.

[0008] The communication management unit is used to transmit fault data of each device in the DC traction power supply system to the industrial control computer;

[0009] The control and monitoring device is used to control the circuit breakers of the corresponding equipment in the DC traction power supply system to open and close under the control of the industrial control computer.

[0010] Furthermore, the training platform also includes an emergency stop button connected to the industrial control computer, which is used to control the power outage of the training platform in an emergency.

[0011] Furthermore, the training platform also includes auxiliary buttons connected to the industrial control computer. The auxiliary buttons include a reset button and a start button. The reset button is used to reset the signals controlling the entire training platform after the experiment is completed, and the start button is used to control the start of the training platform.

[0012] Furthermore, the training platform also includes indicator lights connected to the industrial control computer, which are used to provide light indications when the industrial control computer provides prompts.

[0013] Based on the same concept, the present invention also provides a control method for a DC traction power supply system training platform. The training platform includes an industrial control computer, an analog signal generator, a communication management unit, and a control monitor. The industrial control computer is connected to the analog signal generator, the communication management unit, and the control monitor. The analog signal generator is connected to the protection isolation transmitters of each device in the DC traction power supply system. The communication management unit is connected to the relay protection devices of each device in the DC traction power supply system. The control monitor is connected to the relay protection devices or circuit breakers of each device in the DC traction power supply system.

[0014] The control method includes the following steps:

[0015] The industrial control computer generates control signals based on the fault simulation instructions;

[0016] The analog signal generator generates a fault simulation signal under the control of the control signal and inputs the fault simulation signal to the protection isolation transmitter of the corresponding equipment in the DC traction power supply system; the control monitor controls the circuit breaker of the corresponding equipment in the DC traction power supply system to close under the control of the control signal.

[0017] The relay protection device of the corresponding equipment in the DC traction power supply system determines whether the corresponding occurrence requirement is met. When the corresponding occurrence requirement is met, the relay protection device of the corresponding equipment in the DC traction power supply system starts fault recording and fault protection occurs.

[0018] The relay protection device of the corresponding equipment in the DC traction power supply system transmits the fault data to the industrial control computer through the communication management unit.

[0019] The industrial control computer analyzes the fault data and provides prompts and displays the corresponding fault waveforms based on the analysis results.

[0020] Furthermore, when the equipment in the DC traction power supply system is a DC incoming line cabinet, and the fault simulation command is a first fault simulation command, the control method includes the following steps:

[0021] The industrial control computer generates a first control signal based on the first fault simulation command;

[0022] The analog signal generator generates a first fault simulation signal under the control of the first control signal and inputs the first fault simulation signal to the current protection isolation transmitter of the DC incoming cabinet; the control monitor controls the circuit breaker of the DC incoming cabinet to close under the control of the first control signal.

[0023] The relay protection device of the DC incoming cabinet determines whether the reverse current protection requirement is met. When the reverse current protection requirement is met, the relay protection device of the DC incoming cabinet starts fault recording and reverse current protection occurs.

[0024] The relay protection device of the DC incoming line cabinet transmits the reverse current protection fault data to the industrial control computer through the communication management unit;

[0025] The industrial control computer analyzes the reverse current protection fault data and provides relevant prompts for reverse current protection based on the analysis results, and displays the reverse current protection fault waveform.

[0026] Furthermore, when the equipment in the DC traction power supply system is a DC feeder cabinet, and the fault simulation command is a second fault simulation command, the control method includes the following steps:

[0027] The industrial control computer generates a second control signal based on the second fault simulation command;

[0028] The analog signal generator generates a second fault simulation signal under the control of the second control signal, and inputs the second fault simulation signal to the current protection isolation transmitter of the DC feeder cabinet; the control monitor controls the circuit breaker of the DC feeder cabinet to close under the control of the second control signal.

[0029] The relay protection device of the DC feeder cabinet determines whether the instantaneous overcurrent protection requirement is met. When the instantaneous overcurrent protection requirement is met, the relay protection device of the DC feeder cabinet starts fault recording and instantaneous overcurrent protection occurs.

[0030] The relay protection device of the DC feeder cabinet transmits instantaneous overcurrent protection fault data to the industrial control computer through the communication management unit;

[0031] The industrial control computer analyzes the instantaneous overcurrent protection fault data and provides relevant prompts for instantaneous overcurrent protection based on the analysis results, and displays the instantaneous overcurrent protection fault waveform;

[0032] The relay protection device of the DC feeder cabinet determines whether the reclosing condition is met. When the reclosing condition is met, the relay protection device of the DC feeder cabinet will control the circuit breaker of the DC feeder cabinet to reclose. At the same time, the reclosing command is transmitted to the industrial control computer through the communication management unit. The industrial control computer gives a reclosing prompt according to the reclosing command. When the reclosing condition is not met, the relay protection device of the DC feeder cabinet controls the blocking circuit breaker of the DC feeder cabinet to open.

[0033] When the equipment in the DC traction power supply system is a DC feeder cabinet, and the fault simulation command is a third fault simulation command, the control method includes the following steps:

[0034] The industrial control computer generates a third control signal based on the third fault simulation command;

[0035] The analog signal generator generates a third fault simulation signal under the control of the third control signal, and inputs the third fault simulation signal to the current protection isolation transmitter of the DC feeder cabinet; the control monitor controls the circuit breaker of the DC feeder cabinet to close under the control of the third control signal.

[0036] The relay protection device of the DC feeder cabinet determines whether the delay overcurrent protection requirement is met. When the delay overcurrent protection requirement is met, the relay protection device of the DC feeder cabinet starts fault recording and the delay overcurrent protection occurs.

[0037] The relay protection device of the DC feeder cabinet transmits the delayed overcurrent protection fault data to the industrial control computer through the communication management unit.

[0038] The industrial control computer analyzes the delayed overcurrent protection fault data and provides relevant prompts for delayed overcurrent protection based on the analysis results, and displays the delayed overcurrent protection fault waveform.

[0039] When the equipment in the DC traction power supply system is a DC feeder cabinet, and the fault simulation command is the fourth fault simulation command, the control method includes the following steps:

[0040] The industrial control computer generates a fourth control signal based on the fourth fault simulation instruction;

[0041] The analog signal generator generates a fourth fault analog signal under the control of the fourth control signal, and inputs the fourth fault analog signal to the current protection isolation transmitter of the DC feeder cabinet; the control monitor controls the circuit breaker of the DC feeder cabinet to close under the control of the fourth control signal.

[0042] The relay protection device of the DC feeder cabinet determines whether the requirements for the feeder bus current increment protection are met. When the requirements for the feeder bus current increment protection are met, the relay protection device of the DC feeder cabinet starts fault recording and the feeder bus current increment protection occurs.

[0043] The relay protection device of the DC feeder cabinet transmits the fault data of the feeder bus current increment protection to the industrial control computer through the communication management unit.

[0044] The industrial control computer analyzes the fault data of the feeder bus current increment protection and provides relevant prompts for the feeder bus current increment protection based on the analysis results, and displays the fault waveform of the feeder bus current increment protection.

[0045] Furthermore, when the equipment in the DC traction power supply system is a DC negative switch cabinet, and the fault simulation command is the fifth fault simulation command, the control method includes the following steps:

[0046] The industrial control computer generates a fifth control signal based on the fifth fault simulation instruction;

[0047] The analog signal generator generates a fifth fault analog signal under the control of the fifth control signal, and inputs the fifth fault analog signal to the voltage protection isolation transmitter of the DC negative pole cabinet;

[0048] The relay protection device of the DC negative pole cabinet determines whether the frame voltage alarm or trip protection requirements are met. When the frame voltage alarm or trip protection requirements are met, the relay protection device of the DC negative pole cabinet starts fault recording and the frame voltage alarm or trip protection occurs.

[0049] The relay protection device of the DC negative electrode cabinet transmits frame voltage alarm and trip protection fault data to the industrial control computer through the communication management unit;

[0050] The industrial control computer analyzes the frame voltage alarm and trip protection fault data, and provides relevant prompts for frame voltage alarm and trip protection based on the analysis results, and displays the frame voltage alarm and trip protection fault waveforms;

[0051] When the equipment in the DC traction power supply system is a DC negative switch cabinet, and the fault simulation command is the sixth fault simulation command, the control method includes the following steps:

[0052] The industrial control computer generates a sixth control signal based on the sixth fault simulation command;

[0053] The analog signal generator generates a sixth fault analog signal under the control of the sixth control signal, and inputs the sixth fault analog signal to the current protection isolation transmitter of the DC negative pole cabinet.

[0054] The relay protection device of the DC negative pole cabinet determines whether the frame current trip protection requirement is met. When the frame current trip protection requirement is met, the relay protection device of the DC negative pole cabinet starts fault recording and the frame current trip protection occurs.

[0055] The relay protection device of the DC negative electrode cabinet transmits the frame current trip protection fault data to the industrial control computer through the communication management unit;

[0056] The industrial control computer analyzes the frame current trip protection fault data, and provides relevant prompts for frame current trip protection based on the analysis results, and displays the frame current trip protection fault waveform.

[0057] Furthermore, when the equipment in the DC traction power supply system is a rail potential limiting device, and the fault simulation command is the seventh fault simulation command, the control method includes the following steps:

[0058] The industrial control computer generates a seventh control signal based on the seventh fault simulation instruction;

[0059] The analog signal generator generates a seventh fault analog signal under the control of the seventh control signal, and inputs the seventh fault analog signal to the current protection isolation transmitter of the rail potential limiting device.

[0060] The relay protection device of the rail potential limiting device determines whether the requirements for the occurrence of voltage protection in stages I and II are met. When the requirements for the occurrence of voltage protection in stages I and II are met, the relay protection device of the rail potential limiting device starts fault recording and the voltage protection in stages I and II occurs.

[0061] The relay protection device of the rail potential limiting device transmits the voltage protection fault data of sections I and II to the industrial control computer through the communication management unit.

[0062] The industrial control computer analyzes the fault data of voltage protection in stages I and II, and provides relevant prompts for voltage protection in stages I and II based on the analysis results, and displays the fault waveforms of voltage protection in stages I and II.

[0063] Beneficial effects

[0064] Compared with the prior art, the advantages of the present invention are as follows:

[0065] The present invention performs 1:1 equipment configuration based on a typical DC traction power supply system (i.e., the real DC traction power supply system is consistent with the DC traction power supply system supporting the training platform), can supply power to the equipment once according to 1 / 10 of the DC voltage in the DC traction power supply system, can display the protection working principle of the DC traction power supply system, simulate faults, handle faults and analyze faults, enabling trainees to better master the protection working principle of the DC traction power supply system as well as fault handling and analysis, and improving the speed at which trainees master skills. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only one embodiment of the present invention, and those of ordinary skill in the art can obtain other accompanying drawings based on these drawings without creative efforts.

[0067] Figure 1 It is a schematic structural diagram of a typical DC traction power supply system in an embodiment of the present invention;

[0068] Figure 2 It is a block diagram of the training platform structure of the DC traction power supply system in an embodiment of the present invention;

[0069] Figure 3 It is an external view of the training platform of the DC traction power supply system in an embodiment of the present invention;

[0070] Figure 4 It is a flowchart of the control method of the training platform of the DC traction power supply system in an embodiment of the present invention;

[0071] Figure 5 It is a reverse current loop diagram of the DC incoming line cabinet in an embodiment of the present invention;

[0072] Figure 6 It is a flowchart of simulating the reverse current protection fault of the DC incoming line cabinet using the training platform in an embodiment of the present invention;

[0073] Figure 7 It is a flowchart of simulating the instantaneous overcurrent protection fault of the DC feeder cabinet using the training platform in an embodiment of the present invention;

[0074] Figure 8 It is a flowchart of simulating the delayed overcurrent protection fault of the DC feeder cabinet using the training platform in an embodiment of the present invention;

[0075] Figure 9 It is a flowchart of simulating the △I protection fault of the DC feeder cabinet using the training platform in an embodiment of the present invention;

[0076] Figure 10This is a flowchart illustrating the simulation of DC negative electrode cabinet frame voltage alarm and trip protection faults using a training platform in this embodiment of the invention.

[0077] Figure 11 This is a flowchart illustrating the simulation of DC negative pole cabinet frame current trip protection fault using a training platform in an embodiment of the present invention;

[0078] Figure 12 This is a flowchart illustrating the simulation of voltage protection faults in the rail potential limiting device (sections I and II) using a training platform in an embodiment of the present invention.

[0079] Explanation of reference numerals in the attached diagram: 1-DC incoming line cabinet, 2-DC negative pole cabinet, 3-DC feeder cabinet, 4-Internet disconnect switch cabinet, 5-drain cabinet, 6-rail potential limiting device, 7-industrial control computer, 8-power switch, 9-emergency stop button, 10-auxiliary button, 11-indicator light. Detailed Implementation

[0080] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0081] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0082] Example 1

[0083] like Figure 1 As shown, a typical DC traction power supply system for rail transit vehicles includes a DC incoming line cabinet 1, a DC negative pole cabinet 2, a DC feeder cabinet 3, a drain cabinet 5, a grid disconnect switch cabinet 4, and a rail potential limiting device 6. The DC incoming line cabinet 1 and the DC feeder cabinet 3 are connected to the positive busbar, the DC negative pole cabinet 2 and the drain cabinet 5 are connected to the negative busbar, the DC feeder cabinet 3 is also connected to the up-line contact network and the down-line contact network through the grid disconnect switch cabinet 4, the negative busbar is also connected to the up-line return rail and the down-line return rail, and the rail potential limiting device 6 is connected to the up-line return rail, the down-line return rail, and the grounding flat steel.

[0084] like Figure 2As shown in the figure, the DC traction power supply system training platform provided in this embodiment of the invention includes an industrial control computer 7, an analog signal generator, a communication management unit, and a control monitor. The industrial control computer 7 is connected to the analog signal generator, the communication management unit, and the control monitor. The analog signal generator is connected to the protection isolation transmitters of each device in the DC traction power supply system. The communication management unit is connected to the relay protection devices of each device in the DC traction power supply system. The control monitor is connected to the relay protection devices or circuit breakers of each device in the DC traction power supply system. When the control monitor is connected to the relay protection devices of each device in the DC traction power supply system, under the control of the industrial control computer, the control monitor controls the circuit breakers of the corresponding devices in the DC traction power supply system to open and close the circuits through the relay protection devices of each device. When the control monitor is directly connected to the circuit breakers of each device in the DC traction power supply system, under the control of the industrial control computer, the control monitor directly controls the circuit breakers of the corresponding devices in the DC traction power supply system to open and close the circuits.

[0085] The industrial control computer 7 is used to generate corresponding control signals according to different fault simulation commands; and to analyze the fault data transmitted by the communication management unit, and to give corresponding prompts and display fault waveforms based on the analysis results; the analog signal generator is used to provide fault simulation signals to each device in the DC traction power supply system under the control of the industrial control computer 7; the communication management unit is used to transmit the fault data of each device in the DC traction power supply system to the industrial control computer 7; the control monitor is used to control the circuit breakers of the corresponding devices in the DC traction power supply system to open and close under the control of the industrial control computer 7, and can also monitor the status of each device in the DC traction power supply system through the relay protection devices of each device in the DC traction power supply system.

[0086] In this embodiment, the equipment in the DC traction power supply system includes a DC incoming cabinet 1, a DC feeder cabinet 3, a DC negative terminal cabinet 2, and a rail potential limiting device 6. Figure 1 The system shown has 2 DC incoming line cabinets 1, 4 DC feeder cabinets 3, and 2 DC negative pole cabinets 2. The training platform of this invention simulates the reverse current protection function of the DC incoming line cabinet 1, the instantaneous overcurrent protection, delayed overcurrent protection, and feeder bus current increment protection (i.e., ΔI protection fault) of the DC feeder cabinet 3 for positive and negative short circuits and positive to ground, the frame voltage alarm or trip protection function, the frame current trip protection function of the DC negative pole cabinet 2, and the I-stage and II-stage voltage protection functions of the rail potential limiting device 6.

[0087] The specific working process of the training platform of this invention is as follows: Different fault simulation types are selected on the touch screen of the industrial control computer 7 to generate different fault simulation commands. The industrial control computer 7 generates control signals according to the generated fault simulation commands. The simulation signal generator generates fault simulation signals under the control of the control signals and inputs the fault simulation signals to the protection isolation transmitter of the corresponding equipment in the DC traction power supply system. Under the control of the control signals, the control monitor controls the circuit breaker of the corresponding equipment in the DC traction power supply system to close through the relay protection device of the corresponding equipment in the DC traction power supply system. The relay protection device of the corresponding equipment in the DC traction power supply system determines whether the corresponding fault protection occurrence requirements are met. When the corresponding fault protection occurrence requirements are met, the relay protection device of the corresponding equipment in the DC traction power supply system starts fault waveform recording and fault protection occurs. The relay protection device of the corresponding equipment in the DC traction power supply system transmits the fault data to the industrial control computer 7 through the communication management unit. The industrial control computer 7 analyzes the fault data and gives prompts and displays the corresponding fault waveforms based on the analysis results.

[0088] Figure 3 The diagram shows the external appearance of the training platform. The platform's control panel includes an industrial computer 7, a power switch 8, indicator lights 11, an emergency stop button 9, and auxiliary buttons 10. Indicator lights 11, emergency stop button 9, and auxiliary buttons 10 are all connected to the industrial computer 7. The power switch 8 controls the power supply to the training platform. The emergency stop button 9 controls the power cut-off of the training platform in emergencies to ensure safety and reliability during training. The auxiliary buttons 10 include a reset button and a start button. The reset button controls the platform to reset, and the start button controls the platform to start operation. The indicator lights 11 provide illumination while the industrial computer 7 provides prompts.

[0089] Example 2

[0090] like Figure 2 As shown in the figure, the DC traction power supply system training platform provided in this embodiment of the invention includes an industrial control computer 7, an analog signal generator, a communication management unit, and a control monitor; the industrial control computer 7 is connected to the analog signal generator, the communication management unit, and the control monitor; the analog signal generator is connected to the protection isolation transmitters of each device in the DC traction power supply system; the communication management unit is connected to the relay protection devices of each device in the DC traction power supply system; and the control monitor is connected to the relay protection devices or circuit breakers of each device in the DC traction power supply system.

[0091] like Figure 4 As shown in the figure, the control method of a DC traction power supply system training platform provided by this embodiment of the invention includes the following steps:

[0092] Step S1: Select the fault simulation type on the industrial computer's touch screen to generate the corresponding fault simulation command. The industrial computer generates control signals based on the fault simulation command.

[0093] Step S2: The analog signal generator generates a fault simulation signal under the control of the control signal, and inputs the fault simulation signal to the protection isolation transmitter of the corresponding equipment in the DC traction power supply system;

[0094] The control monitor controls the circuit breaker of the corresponding equipment in the DC traction power supply system to close under the control of the control signal; when the control monitor is connected to the relay protection device of each equipment in the DC traction power supply system, the control monitor controls the circuit breaker of the corresponding equipment in the DC traction power supply system to open and close under the control of the industrial control computer; when the control monitor is directly connected to the circuit breaker of each equipment in the DC traction power supply system, the control monitor directly controls the circuit breaker of the corresponding equipment in the DC traction power supply system to open and close under the control of the industrial control computer.

[0095] Step S3: The relay protection device of the corresponding equipment in the DC traction power supply system determines whether the corresponding fault protection occurrence requirements are met. When the corresponding fault protection occurrence requirements are met, the relay protection device of the corresponding equipment in the DC traction power supply system starts fault recording and fault protection occurs.

[0096] Step S4: The relay protection device of the corresponding equipment in the DC traction power supply system transmits the fault data to the industrial control computer through the communication management unit;

[0097] Step S5: The industrial control computer analyzes the fault data transmitted by the communication management unit, and provides prompts and displays the corresponding fault waveforms based on the analysis results.

[0098] In this embodiment, the equipment in the DC traction power supply system includes a DC incoming line cabinet, a DC feeder cabinet, a DC negative terminal cabinet, and a rail potential limiting device. The simulated fault types include reverse current protection faults in the DC incoming line cabinet, instantaneous overcurrent protection faults in the DC feeder cabinet, delayed overcurrent protection faults in the DC feeder cabinet, incremental current protection faults on the DC feeder cabinet's outgoing bus (i.e., ΔI protection faults), frame voltage alarm or trip protection faults in the DC negative terminal cabinet, frame current trip protection faults in the DC negative terminal cabinet, and voltage protection faults in sections I and II of the rail potential limiting device.

[0099] Example 3

[0100] When the equipment in the DC traction power supply system is a DC incoming cabinet, the fault simulation type includes DC incoming cabinet reverse current protection fault. For example... Figure 1As shown, in a DC traction power supply system, each traction substation consists of two sets of traction transformer rectifier units, forming two DC power supplies, which are output to the positive busbar through two DC incoming line cabinets. When both DC incoming line cabinets are in the closed position, if the cable connecting one DC incoming line cabinet to the rectifier breaks and grounds, it will cause a reverse current in the other DC incoming line cabinet (e.g., Figure 5 (The reverse current formation circuit diagram shown) The shunt at the outgoing end of the DC incoming line cabinet converts the primary side reverse current signal into an mV signal and transmits it to the input of the current protection isolation transmitter (during fault simulation, this mV signal is generated by the analog signal generator and transmitted to the input of the current protection isolation transmitter). The current protection isolation transmitter isolates and converts the mV signal into an mA signal and transmits it to the input of the relay protection device. The relay protection device determines whether there is reverse current through sampling comparison and logic operation. When the reverse current reaches the reverse current protection threshold, the circuit breaker in the DC incoming line cabinet (i.e., the DC incoming line circuit breaker) trips, realizing reverse current protection.

[0101] Based on the reverse current protection principle of the DC incoming line cabinet, such as Figure 6 As shown, when the equipment in the DC traction power supply system is a DC incoming line cabinet, and the fault simulation command is the first fault simulation command (i.e., the reverse current protection fault simulation command), the control method of the training platform of this invention includes the following steps:

[0102] Step A1: The industrial control computer generates a first control signal based on the first fault simulation command;

[0103] Step A2: The first mV signal output terminal of the analog signal generator is reversed with the input terminal of the current protection isolation transmitter of the DC incoming line cabinet (i.e., the positive terminal of the first mV signal output terminal is connected to the negative terminal of the input terminal of the current protection isolation transmitter of the DC incoming line cabinet, and the negative terminal of the first mV signal output terminal is connected to the positive terminal of the input terminal of the current protection isolation transmitter of the DC incoming line cabinet). Under the control of the first control signal, the analog signal generator generates a gradually increasing first fault analog signal (i.e., the first mV signal) and inputs the first fault analog signal to the current protection isolation transmitter of the DC incoming line cabinet.

[0104] The control monitor controls the circuit breaker of the DC incoming line cabinet to close under the control of the first control signal;

[0105] Step A3: The relay protection device of the DC incoming line cabinet determines whether the reverse current protection requirement is met through sampling comparison and logic operation:

[0106] If any of the following conditions are not met: the simulated fault signal is greater than the reverse current protection threshold, the circuit breaker of the DC incoming line cabinet is in the closed state, or the DC traction power supply system has no other external interlocks (i.e., no external equipment is interlocked with the DC traction power supply system), it indicates that the reverse current protection requirement is not met.

[0107] When the first fault simulation signal is greater than the reverse current protection threshold, the circuit breaker of the DC incoming cabinet is in the closed state, and there are no other external interlocks in the DC traction power supply system, it indicates that the reverse current protection requirement is met. The reverse current protection occurs and the relay protection device of the DC incoming cabinet starts fault recording. The relay protection device of the DC incoming cabinet controls its circuit breaker to trip.

[0108] Step A4: The relay protection device of the DC incoming line cabinet transmits the reverse current protection fault data to the industrial control computer through the communication management unit; the reverse current protection fault data includes the reverse current protection threshold, circuit breaker status, external interlocking signals, and the reverse current protection fault waveform recorded by the relay protection device when the reverse current protection occurs.

[0109] Step A5: The industrial control computer analyzes the reverse current protection threshold, circuit breaker status, and external interlocking signals. If the analysis results indicate that the reverse current protection requirements are not met, a prompt indicating that the reverse current protection requirements are not met will be given, and the reason for not meeting the reverse current protection requirements can be determined. If the analysis results indicate that the reverse current protection requirements are met, a prompt indicating that the reverse current protection requirements are met will be given, and the reverse current protection fault waveform transmitted by the communication management unit will be displayed on its touch screen.

[0110] Example 4

[0111] When the equipment in the DC traction power supply system is a DC feeder cabinet, the fault simulation types include DC feeder cabinet instantaneous overcurrent protection fault, DC feeder cabinet delayed overcurrent protection fault, and DC feeder cabinet outgoing bus current increment protection fault (i.e., ΔI protection fault).

[0112] When a metallic near-end short circuit occurs in the overhead contact line, it is characterized by a relatively large short-circuit current and a rapid current rise. The primary-side shunt of the DC feeder cabinet converts the detected short-circuit current into a mV signal. This mV signal is then converted into a mA signal by the current protection isolation transmitter and input to the input terminal of the relay protection device (in fault simulation, this mV signal is generated by an analog signal generator and transmitted to the input terminal of the current protection isolation transmitter). The relay protection device determines whether there is a transient overcurrent through sampling comparison and logic operations. When the detected current exceeds the operating current of the DC feeder cabinet, the protection is activated and a timer begins. If the detected current exceeds the operating current of the DC feeder cabinet throughout the timer, the protection trips, i.e., the relay protection device controls the circuit breaker to trip.

[0113] Based on the principle of instantaneous overcurrent protection of DC feeder cabinets, such as Figure 7 As shown, when the equipment in the DC traction power supply system is a DC feeder cabinet, and the fault simulation command is the second fault simulation command (i.e., the instantaneous overcurrent protection fault simulation command), the control method of the training platform of this invention includes the following steps:

[0114] Step B1: The industrial control computer generates a second control signal based on the second fault simulation command;

[0115] Step B2: The second mV signal output terminal of the analog signal generator is connected to the input terminal of the current protection isolation transmitter of the DC feeder cabinet (i.e., positive connection). Under the control of the second control signal, the analog signal generator generates an instantaneous second fault analog signal (i.e., the second mV signal) and inputs the second fault analog signal to the current protection isolation transmitter of the DC feeder cabinet.

[0116] The control monitor controls the circuit breaker of the DC feeder cabinet to close under the control of the second control signal;

[0117] Step B3: The relay protection device of the DC feeder cabinet determines whether the instantaneous overcurrent protection requirements are met through sampling comparison and logic operation.

[0118] If any of the following conditions are not met: the second fault simulation signal is greater than the instantaneous overcurrent protection threshold, the circuit breaker of the DC feeder cabinet is in the closed state, or there are no other external interlocks in the DC traction power supply system, it indicates that the instantaneous overcurrent protection requirement is not met.

[0119] When the second fault simulation signal is greater than the instantaneous overcurrent protection threshold, the circuit breaker of the DC feeder cabinet is in the closed state, and there are no other external interlocks in the DC traction power supply system, it indicates that the instantaneous overcurrent protection requirement is met. The instantaneous overcurrent protection occurs and the relay protection device of the DC feeder cabinet starts fault recording. The relay protection device of the DC feeder cabinet controls its circuit breaker to trip.

[0120] Step B4: The relay protection device of the DC feeder cabinet transmits the instantaneous overcurrent protection fault data to the industrial control computer through the communication management unit; the instantaneous overcurrent protection fault data includes the instantaneous overcurrent protection threshold, circuit breaker status, external interlocking signals, and the instantaneous overcurrent protection fault waveform recorded by the relay protection device when the instantaneous overcurrent protection occurs.

[0121] Step B5: The industrial control computer analyzes the instantaneous overcurrent protection threshold, circuit breaker status, and external interlocking signals. If the analysis results indicate that the instantaneous overcurrent protection requirements are not met, a prompt indicating that the instantaneous overcurrent protection requirements are not met is given, and the reason for not meeting the instantaneous overcurrent protection requirements can be determined. If the analysis results indicate that the instantaneous overcurrent protection requirements are met, a prompt indicating that the instantaneous overcurrent protection requirements are met is given, and the instantaneous overcurrent protection fault waveform transmitted by the communication management unit is displayed on its touch screen.

[0122] Step B6: The relay protection device of the DC feeder cabinet determines whether the reclosing conditions are met through sampling comparison and logic operation:

[0123] When the reclosing conditions are met, the relay protection device of the DC feeder cabinet will control the circuit breaker of the DC feeder cabinet to reclose. At the same time, the reclosing command is transmitted to the industrial control computer through the communication management unit, and the industrial control computer gives a reclosing prompt according to the reclosing command.

[0124] When the reclosing conditions are not met, the relay protection device of the DC feeder cabinet controls the circuit breaker of the DC feeder cabinet to open.

[0125] In this embodiment, the instantaneous overcurrent protection threshold is three times the operating current of the DC feeder cabinet.

[0126] When a short circuit occurs at the far end of the overhead contact line, it is characterized by a relatively small short-circuit current and a long operating delay. The shunt on the primary side of the DC feeder cabinet converts the detected short-circuit current into a mV signal. This mV signal is then converted into a mA signal by the current protection isolation transmitter and input to the input terminal of the relay protection device. The relay protection device determines whether there is a delayed overcurrent by sampling comparison and logic operation. When the detected current is greater than the operating current of the DC feeder cabinet, the protection is activated and a timer begins. If the detected current is greater than the operating current of the DC feeder cabinet throughout the timer, the protection trips, i.e., the relay protection device controls the circuit breaker to trip. If the detected current is less than the operating current of the DC feeder cabinet at any moment during the timer, the protection returns, i.e., the relay protection device resets.

[0127] Based on the time-delay overcurrent protection principle of DC feeder cabinets, such as Figure 8 As shown, when the equipment in the DC traction power supply system is a DC feeder cabinet, and the fault simulation command is the third fault simulation command (i.e., the time-delayed overcurrent protection fault simulation command), the control method of the training platform of this invention includes the following steps:

[0128] Step C1: The industrial control computer generates a third control signal based on the third fault simulation instruction;

[0129] Step C2: The third mV signal output terminal of the analog signal generator is connected to the input terminal of the current protection isolation transmitter of the DC feeder cabinet. Under the control of the third control signal, the analog signal generator generates the third fault analog signal (i.e., the third mV signal) and inputs the third fault analog signal to the current protection isolation transmitter of the DC feeder cabinet.

[0130] The control monitor controls the circuit breaker of the DC feeder cabinet to close under the control of the third control signal;

[0131] Step C3: The relay protection device of the DC feeder cabinet determines whether the time-delay overcurrent protection requirement is met through sampling comparison and logic operation.

[0132] If any of the following conditions are not met: the simulated third fault signal is greater than the time-delayed overcurrent protection threshold, the circuit breaker of the DC feeder cabinet is in the closed state, or there are no other external interlocks in the DC traction power supply system, it indicates that the time-delayed overcurrent protection requirement is not met.

[0133] When the third fault simulation signal is greater than the time-delayed overcurrent protection threshold, the circuit breaker of the DC feeder cabinet is in the closed state, and there are no other external interlocks in the DC traction power supply system, it indicates that the time-delayed overcurrent protection requirement is met. The time-delayed overcurrent protection occurs and the relay protection device of the DC feeder cabinet starts fault recording. The relay protection device of the DC feeder cabinet controls its circuit breaker to trip.

[0134] Step C4: The relay protection device of the DC feeder cabinet transmits the delayed overcurrent protection fault data to the industrial control computer through the communication management unit; the delayed overcurrent protection fault data includes the delayed overcurrent protection threshold, circuit breaker status, external interlocking signal, and the delayed overcurrent protection fault waveform recorded by the relay protection device when the delayed overcurrent protection occurs.

[0135] Step C5: The industrial control computer analyzes the time-delay overcurrent protection threshold, circuit breaker status, and external interlocking signals. If the analysis results indicate that the time-delay overcurrent protection requirements are not met, a prompt indicating that the time-delay overcurrent protection requirements are not met will be given, and the reason for not meeting the time-delay overcurrent protection requirements can be determined. If the analysis results indicate that the time-delay overcurrent protection requirements are met, a prompt indicating that the time-delay overcurrent protection requirements are met will be given, and the time-delay overcurrent protection fault waveform transmitted by the communication management unit will be displayed on its touch screen.

[0136] In this embodiment, the time-delay overcurrent protection threshold is the operating current of the DC feeder cabinet.

[0137] When a short circuit occurs at the far end of the overhead contact line, the bus current increment is monitored periodically to predict possible short circuit faults before the bus current may reach the expected peak current. The primary side shunt of the DC feeder cabinet converts the detected short circuit current into an mV signal. The mV signal is then converted into an mA signal by the isolation of the current protection isolation transmitter and input to the input terminal of the relay protection device. The relay protection device determines whether there is feeder bus current increment protection through sampling comparison and logic operation. The current increment judgment process is as follows: At any moment, if the current rise rate di / dt is detected to be greater than the set value di (di represents the minimum di / dt value for starting "ΔI" calculation and the monitoring reset value), then the protection is activated, and the timing tDi (tDi represents the trip delay time) is started, and the current value ib1 at that point is recorded as the calculation base point; During the tDi time, the current rise rate di / dt is always greater than the set value di. After the timing ends, the current difference ΔI = i - ib1 is calculated, where i represents the current after the timing ends. If the current difference ΔI is greater than the current increment trip value DI, then the protection trips; After the tDi timing ends, if the calculated current difference ΔI is less than the current increment trip value DI, then the protection returns, and the relay protection device resets; Before the tDi timing ends, if the trip delay time tDi is reached within the time when the current rise rate di / dt is lower than the current increment trip value DI, then the protection returns, and the relay protection device resets.

[0138] Based on the principle of incremental current protection for the outgoing bus of a DC feeder cabinet, such as Figure 9 As shown, when the equipment in the DC traction power supply system is a DC feeder cabinet, and the fault simulation command is the fourth fault simulation command (i.e., the feeder bus current increment protection fault simulation command), the control method of the training platform of this invention includes the following steps:

[0139] Step D1: The industrial control computer generates the fourth control signal based on the fourth fault simulation instruction;

[0140] Step D2: The fourth mV signal output terminal of the analog signal generator is connected to the input terminal of the current protection isolation transmitter of the DC feeder cabinet. Under the control of the fourth control signal, the analog signal generator generates the fourth fault simulation signal (i.e., the fourth mV signal, which increases the bus current by ΔI within a set time (i.e., the trip delay time) and inputs the fourth fault simulation signal to the current protection isolation transmitter of the DC feeder cabinet.

[0141] The control monitor controls the circuit breaker of the DC feeder cabinet to close under the control of the fourth control signal;

[0142] Step D3: The relay protection device of the DC feeder cabinet determines whether the requirements for incremental current protection of the feeder bus are met through sampling comparison and logic operation.

[0143] If any of the following conditions are not met during the feeder current increment judgment process, it indicates that the feeder bus current increment protection requirement is not met.

[0144] When the fourth fault simulation signal meets the following conditions during the feeder current increment judgment process: the current difference is greater than the current increment trip value and the protection trips, the circuit breaker of the DC feeder cabinet is in the closed state, and there are no other external interlocks in the DC traction power supply system, it indicates that the feeder bus current increment protection requirement is met. The feeder bus current increment protection occurs and the relay protection device of the DC feeder cabinet starts fault recording. The relay protection device of the DC feeder cabinet controls its circuit breaker to trip.

[0145] Step D4: The relay protection device of the DC feeder cabinet transmits the feeder bus current incremental protection fault data to the industrial control computer through the communication management unit; the feeder bus current incremental protection fault data includes the incremental protection threshold, circuit breaker status, external interlocking signal, and the feeder bus current incremental protection fault waveform recorded by the relay protection device when the feeder bus current incremental protection occurs.

[0146] Step D5: The industrial control computer analyzes the incremental protection threshold, circuit breaker status, and external interlocking signals. If the analysis results determine that the requirements for incremental protection of the feeder bus current are not met, a prompt indicating that the requirements for incremental protection of the feeder bus current are not met will be given, and the reason for not meeting the requirements for incremental protection of the feeder bus current will be determined. If the analysis results determine that the requirements for incremental protection of the feeder bus current are met, a prompt indicating that the requirements for incremental protection of the feeder bus current are met will be given, and the fault waveform of incremental protection of the feeder bus current transmitted by the communication management unit will be displayed on the touch screen of the industrial control computer.

[0147] Example 5

[0148] When the equipment in the DC traction power supply system is a DC negative switch cabinet, the fault simulation types include DC negative switch cabinet frame voltage alarm or trip protection fault, and DC negative switch cabinet frame current trip fault. The frame refers to the cabinet frame of the DC traction power supply system.

[0149] When the positive terminal is short-circuited to the cabinet frame or when current leaks, the shunt connected to the frame and ground detects a mV signal. The current protection isolation transmitter isolates and converts the mV signal into a mA signal and inputs it to the relay protection device. The relay protection device determines whether the current exceeds the set value through sampling comparison and logic operation. If so, the frame current protection operates. When the rail-to-ground leakage resistance is large and the leakage current is small, the frame voltage protection operates as backup protection. The voltage protection isolation transmitter isolates and converts the rail-to-ground voltage into a mA signal and inputs it to the relay protection device. The relay protection device determines whether the current exceeds the frame voltage alarm threshold through sampling comparison and logic operation. If so, the frame voltage alarm operates; if it exceeds the frame voltage trip threshold, the frame current trips.

[0150] Based on the frame voltage alarm or trip protection principle of the DC negative terminal cabinet, such as Figure 10 As shown, when the equipment in the DC traction power supply system is a DC negative switch cabinet, and the fault simulation command is the fifth fault simulation command (i.e., frame voltage alarm or trip protection fault simulation command), the control method of the training platform of this invention includes the following steps:

[0151] Step E1: The industrial control computer generates the fifth control signal based on the fifth fault simulation instruction;

[0152] Step E2: The DC voltage signal output terminal of the analog signal generator is connected to the input terminal of the voltage protection isolation transmitter of the DC negative pole cabinet. Under the control of the fifth control signal, the analog signal generator generates an increasing fifth fault analog signal (i.e., DC voltage signal) and inputs the fifth fault analog signal to the voltage protection isolation transmitter of the DC negative pole cabinet.

[0153] Step E3: The relay protection device of the DC negative terminal cabinet determines whether the frame voltage alarm or trip protection requirements are met through sampling comparison and logic operation:

[0154] When the fifth fault simulation signal is less than the frame voltage trip threshold and greater than the frame voltage alarm threshold, and when any of the following conditions are not met in the DC traction power supply system: the frame voltage alarm protection requirement is not met.

[0155] When the fifth fault simulation signal is greater than the frame voltage trip threshold, and when any of the following conditions are not met in the DC traction power supply system, it indicates that the frame voltage trip protection requirement is not met.

[0156] When the fifth fault simulation signal is less than the frame voltage trip threshold and greater than the frame voltage alarm threshold, and there are no other external interlocks in the DC traction power supply system, it indicates that the frame voltage alarm protection requirement is met, the frame voltage alarm protection occurs, and the relay protection device of the DC negative pole cabinet starts fault recording.

[0157] When the fifth fault simulation signal is greater than the frame voltage trip threshold and there are no other external interlocks in the DC traction power supply system, it indicates that the frame voltage trip protection requirement is met, the frame voltage trip protection occurs, and the relay protection device of the DC negative pole cabinet starts fault recording.

[0158] Step E4: The relay protection device of the DC negative terminal cabinet transmits the frame voltage alarm and trip protection fault data to the industrial control computer through the communication management unit; among which, the frame voltage alarm and trip protection fault data include the frame voltage alarm threshold, the frame voltage trip threshold, the external interlocking signal, the frame voltage alarm protection fault waveform recorded by the relay protection device when the frame voltage alarm protection occurs, and the frame voltage trip protection fault waveform recorded by the relay protection device when the frame voltage trip protection occurs.

[0159] Step E5: The industrial control computer analyzes the frame voltage alarm threshold, frame voltage trip threshold, and external interlocking signals. If the analysis results determine that the frame voltage alarm protection requirements are not met, a prompt indicating that the requirements are not met is given, and the reason for not meeting the requirements can be determined. If the analysis results determine that the frame voltage trip protection requirements are not met, a prompt indicating that the requirements are not met is given, and the reason for not meeting the requirements can be determined. If the analysis results determine that the frame voltage alarm protection requirements are met, a prompt indicating that the requirements are met is given, and the frame voltage alarm protection fault waveform transmitted by the communication management unit is displayed on the industrial control computer's touch screen. If the analysis results determine that the frame voltage trip protection requirements are met, a prompt indicating that the requirements are met is given, and the frame voltage trip protection fault waveform transmitted by the communication management unit is displayed on the industrial control computer's touch screen.

[0160] When the positive terminal is short-circuited to the cabinet frame or when there is current leakage, the shunt connected to the frame and ground detects a mV signal. The current protection isolation transmitter isolates the mV signal and converts it into an mA signal, which is then input to the relay protection device. The relay protection device determines whether the current is greater than the set value through sampling comparison and logic operation. If so, the frame current protection will activate.

[0161] Based on the frame current trip protection principle of DC negative switchgear, such as Figure 11 As shown, when the equipment in the DC traction power supply system is a DC negative switch cabinet, and the fault simulation command is the sixth fault simulation command (i.e., the frame current trip protection fault simulation command), the control method of the training platform of this invention includes the following steps:

[0162] Step F1: The industrial control computer generates the sixth control signal based on the sixth fault simulation instruction;

[0163] Step F2: The fifth mV signal output terminal of the analog signal generator is connected to the input terminal of the current protection isolation transmitter of the DC negative pole cabinet. Under the control of the sixth control signal, the analog signal generator generates an increasing sixth fault analog signal (i.e., the fifth mV signal) and inputs the sixth fault analog signal to the current protection isolation transmitter of the DC negative pole cabinet.

[0164] Step F3: The relay protection device of the DC negative terminal cabinet determines whether the frame current trip protection requirements are met through sampling comparison and logic operation.

[0165] When the sixth fault simulation signal is greater than the frame current trip threshold, and when any of the following conditions are not met in the DC traction power supply system, it indicates that the frame current trip protection requirement is not met.

[0166] When the sixth fault simulation signal is greater than the frame current trip threshold and there are no other external interlocks in the DC traction power supply system, it indicates that the frame current trip protection requirement is met, the frame current trip protection occurs, and the relay protection device of the DC negative pole cabinet starts fault recording.

[0167] Step F4: The relay protection device of the DC negative terminal cabinet transmits the frame current trip protection fault data to the industrial control computer through the communication management unit; wherein, the frame current trip protection fault data includes the frame current trip threshold, external interlocking signal and the frame current trip protection fault waveform recorded by the relay protection device when the frame current trip protection occurs.

[0168] Step F5: The industrial control computer analyzes the frame current trip threshold and external interlocking signals. If the analysis results determine that the frame current trip protection requirements are not met, a prompt indicating that the frame current trip protection requirements are not met will be given, and the reason for not meeting the frame current trip protection requirements can be determined. If the analysis results determine that the frame current trip protection requirements are met, a prompt indicating that the frame current trip protection requirements are met will be given, and the frame current trip protection fault waveform transmitted by the communication management unit will be displayed on the touch screen of the industrial control computer.

[0169] Example 6

[0170] When the equipment in the DC traction power supply system is a rail potential limiting device, the fault simulation types include voltage protection faults of the rail potential limiting device in stages I and II.

[0171] When a train starts or runs in the power supply section, or when a ground leakage fault occurs, a voltage difference is generated between the rail and the ground due to the leakage resistance between the rail and the ground. When the rail potential limiting device detects that the voltage difference between the rail and the ground is greater than the first-stage operating voltage of the rail potential limiting device, it outputs a first-stage voltage alarm signal; when the rail potential limiting device detects that the voltage difference between the rail and the ground is greater than the second-stage operating voltage of the rail potential limiting device, the contactor quickly and permanently closes, and does not resume opening.

[0172] Based on the voltage protection principle of the first and second stages of the rail potential limiting device, such as Figure 12 As shown, when the equipment in the DC traction power supply system is a rail potential limiting device, and the fault simulation command is the seventh fault simulation command (i.e., the voltage protection fault simulation command for stage I and stage II), the control method of the training platform of this invention includes the following steps:

[0173] Step G1: The industrial control computer generates the seventh control signal according to the seventh fault simulation instruction;

[0174] Step G2: The sixth mV signal output terminal of the analog signal generator is connected to the input terminal of the current protection isolation transmitter of the rail potential limiting device. Under the control of the seventh control signal, the analog signal generator generates an increasing seventh fault analog signal (i.e., the sixth mV signal) and inputs the seventh fault analog signal to the current protection isolation transmitter of the rail potential limiting device.

[0175] Step G3: The relay protection device of the rail potential limiting device determines whether the requirements for stage I and stage II voltage protection are met through sampling comparison and logic operation:

[0176] When the seventh fault simulation signal is less than the stage II voltage protection threshold and greater than the stage I voltage protection threshold, and when any of the following conditions are not met in the DC traction power supply system: there are no other external interlocks, it indicates that the stage I voltage alarm protection requirement is not met.

[0177] When the seventh fault simulation signal is greater than the stage II voltage protection threshold, and when any of the following conditions are not met in the DC traction power supply system other external interlocks, it indicates that the requirements for stage II voltage trip protection are not met.

[0178] When the seventh fault simulation signal is less than the voltage protection threshold of stage II and greater than the voltage protection threshold of stage I, and there are no other external interlocks in the DC traction power supply system, it indicates that the requirements for the occurrence of stage I voltage alarm protection are met, stage I voltage alarm protection occurs, and the relay protection device of the rail potential limiting device starts fault recording.

[0179] When the seventh fault simulation signal is greater than the voltage protection threshold of section II, and there are no other external interlocks in the DC traction power supply system, it indicates that the requirements for the trip protection of section II are met. The voltage trip protection of section II occurs and the relay protection device of the rail potential limiting device starts fault recording.

[0180] Step G4: The relay protection device of the rail potential limiting device transmits the fault data of stage I and stage II voltage protection to the industrial control computer through the communication management unit; wherein, the fault data of stage I and stage II voltage protection includes stage I voltage protection threshold, stage II voltage protection threshold, external interlocking signal, stage I voltage alarm protection fault waveform recorded by the relay protection device when stage I voltage alarm protection occurs, and stage II voltage trip protection fault waveform recorded by the relay protection device when stage II voltage trip protection occurs;

[0181] Step G5: The industrial control computer analyzes the Stage I voltage protection threshold, Stage II voltage protection threshold, and external interlocking signals. If the analysis results determine that the Stage I voltage alarm protection requirements are not met, a prompt indicating that the Stage I voltage alarm protection requirements are not met is given, and the reason for not meeting the Stage I voltage alarm protection requirements can be determined. If the analysis results determine that the Stage II voltage trip protection requirements are not met, a prompt indicating that the Stage II voltage trip protection requirements are not met is given, and the reason for not meeting the Stage II voltage trip protection requirements can be determined. If the analysis results determine that the requirements for the occurrence of stage I voltage alarm protection are met, a prompt indicating that the requirements for stage I voltage alarm protection are met will be given, and the stage I voltage alarm protection fault waveform transmitted by the communication management unit will be displayed on the touch screen of the industrial control computer. If the analysis results determine that the requirements for the occurrence of stage II voltage trip protection are met, a prompt indicating that the requirements for the occurrence of stage II voltage trip protection are met will be given, and the stage II voltage trip protection fault waveform transmitted by the communication management unit will be displayed on the touch screen of the industrial control computer.

[0182] The above description only discloses specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or modifications that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A training platform for a DC traction power supply system, characterized in that, The training platform includes an industrial control computer, an analog signal generator, a communication management unit, and a control monitor. The industrial control computer is connected to the analog signal generator, the communication management unit, and the control monitor. The analog signal generator is connected to the protection and isolation transmitters of each device in the DC traction power supply system. The communication management unit is connected to the relay protection devices of each device in the DC traction power supply system. The control monitor is connected to the relay protection devices or circuit breakers of each device in the DC traction power supply system. Each device in the DC traction power supply system includes a DC incoming line cabinet, a DC feeder cabinet, a DC negative pole cabinet, and a rail potential limiting device. The industrial control computer is used to generate corresponding control signals according to different fault simulation instructions; and to analyze the fault data transmitted by the communication management unit, and to give corresponding prompts and display fault waveforms based on the analysis results. The analog signal generator is used to provide fault simulation signals to each device in the DC traction power supply system under the control of the industrial control computer. The communication management unit is used to transmit fault data of each device in the DC traction power supply system to the industrial control computer; The control and monitoring device is used to control the circuit breakers of the corresponding equipment in the DC traction power supply system to open and close under the control of the industrial control computer.

2. The DC traction power supply system training platform according to claim 1, characterized in that, The training platform also includes an emergency stop button connected to the industrial control computer, which is used to control the power outage of the training platform in an emergency.

3. The DC traction power supply system training platform according to claim 1, characterized in that, The training platform also includes auxiliary buttons connected to the industrial control computer. The auxiliary buttons include a reset button and a start button. The reset button is used to reset the signals of the entire training platform after the experiment is completed, and the start button is used to control the start of the training platform.

4. The DC traction power supply system training platform according to any one of claims 1 to 3, characterized in that, The training platform also includes indicator lights connected to the industrial control computer, which are used to provide light indications when the industrial control computer provides prompts.

5. A control method for a DC traction power supply system training platform, characterized in that: The training platform includes an industrial control computer, an analog signal generator, a communication management unit, and a control monitor. The industrial control computer is connected to the analog signal generator, the communication management unit, and the control monitor. The analog signal generator is connected to the protection and isolation transmitters of each device in the DC traction power supply system. The communication management unit is connected to the relay protection devices of each device in the DC traction power supply system. The control monitor is connected to the relay protection devices or circuit breakers of each device in the DC traction power supply system. Each device in the DC traction power supply system includes a DC incoming line cabinet, a DC feeder cabinet, a DC negative pole cabinet, and a rail potential limiting device. The control method includes the following steps: The industrial control computer generates control signals based on the fault simulation instructions; The analog signal generator generates a fault simulation signal under the control of the control signal and inputs the fault simulation signal to the protection isolation transmitter of the corresponding equipment in the DC traction power supply system; the control monitor controls the circuit breaker of the corresponding equipment in the DC traction power supply system to close under the control of the control signal. The relay protection device of the corresponding equipment in the DC traction power supply system determines whether the corresponding fault protection occurrence requirement is met. When the corresponding fault protection occurrence requirement is met, the relay protection device of the corresponding equipment in the DC traction power supply system starts fault recording and fault protection occurs. The relay protection device of the corresponding equipment in the DC traction power supply system transmits the fault data to the industrial control computer through the communication management unit. The industrial control computer analyzes the fault data and provides prompts and displays the corresponding fault waveforms based on the analysis results.

6. The control method for the DC traction power supply system training platform according to claim 5, characterized in that: When the equipment in the DC traction power supply system is a DC incoming line cabinet, and the fault simulation command is a first fault simulation command, the control method includes the following steps: The industrial control computer generates a first control signal based on the first fault simulation command; The analog signal generator generates a first fault simulation signal under the control of the first control signal and inputs the first fault simulation signal to the current protection isolation transmitter of the DC incoming cabinet; the control monitor controls the circuit breaker of the DC incoming cabinet to close under the control of the first control signal. The relay protection device of the DC incoming cabinet determines whether the reverse current protection requirement is met. When the reverse current protection requirement is met, the relay protection device of the DC incoming cabinet starts fault recording and reverse current protection occurs. The relay protection device of the DC incoming line cabinet transmits the reverse current protection fault data to the industrial control computer through the communication management unit; The industrial control computer analyzes the reverse current protection fault data and provides relevant prompts for reverse current protection based on the analysis results, and displays the reverse current protection fault waveform.

7. The control method for the DC traction power supply system training platform according to claim 5, characterized in that: When the equipment in the DC traction power supply system is a DC feeder cabinet, and the fault simulation command is a second fault simulation command, the control method includes the following steps: The industrial control computer generates a second control signal based on the second fault simulation command; The analog signal generator generates a second fault simulation signal under the control of the second control signal, and inputs the second fault simulation signal to the current protection isolation transmitter of the DC feeder cabinet; the control monitor controls the circuit breaker of the DC feeder cabinet to close under the control of the second control signal. The relay protection device of the DC feeder cabinet determines whether the instantaneous overcurrent protection requirement is met. When the instantaneous overcurrent protection requirement is met, the relay protection device of the DC feeder cabinet starts fault recording and instantaneous overcurrent protection occurs. The relay protection device of the DC feeder cabinet transmits instantaneous overcurrent protection fault data to the industrial control computer through the communication management unit; The industrial control computer analyzes the instantaneous overcurrent protection fault data and provides relevant prompts for instantaneous overcurrent protection based on the analysis results, and displays the instantaneous overcurrent protection fault waveform; The relay protection device of the DC feeder cabinet determines whether the reclosing condition is met. When the reclosing condition is met, the relay protection device of the DC feeder cabinet will control the circuit breaker of the DC feeder cabinet to reclose. At the same time, the reclosing command is transmitted to the industrial control computer through the communication management unit. The industrial control computer gives a reclosing prompt according to the reclosing command. When the reclosing condition is not met, the relay protection device of the DC feeder cabinet controls the blocking circuit breaker of the DC feeder cabinet to open. When the equipment in the DC traction power supply system is a DC feeder cabinet, and the fault simulation command is a third fault simulation command, the control method includes the following steps: The industrial control computer generates a third control signal based on the third fault simulation command; The analog signal generator generates a third fault simulation signal under the control of the third control signal, and inputs the third fault simulation signal to the current protection isolation transmitter of the DC feeder cabinet; the control monitor controls the circuit breaker of the DC feeder cabinet to close under the control of the third control signal. The relay protection device of the DC feeder cabinet determines whether the delay overcurrent protection requirement is met. When the delay overcurrent protection requirement is met, the relay protection device of the DC feeder cabinet starts fault recording and the delay overcurrent protection occurs. The relay protection device of the DC feeder cabinet transmits the delayed overcurrent protection fault data to the industrial control computer through the communication management unit. The industrial control computer analyzes the delayed overcurrent protection fault data and provides relevant prompts for delayed overcurrent protection based on the analysis results, and displays the delayed overcurrent protection fault waveform. When the equipment in the DC traction power supply system is a DC feeder cabinet, and the fault simulation command is the fourth fault simulation command, the control method includes the following steps: The industrial control computer generates a fourth control signal based on the fourth fault simulation instruction; The analog signal generator generates a fourth fault analog signal under the control of the fourth control signal, and inputs the fourth fault analog signal to the current protection isolation transmitter of the DC feeder cabinet; the control monitor controls the circuit breaker of the DC feeder cabinet to close under the control of the fourth control signal. The relay protection device of the DC feeder cabinet determines whether the requirements for the feeder bus current increment protection are met. When the requirements for the feeder bus current increment protection are met, the relay protection device of the DC feeder cabinet starts fault recording and the feeder bus current increment protection occurs. The relay protection device of the DC feeder cabinet transmits the fault data of the feeder bus current increment protection to the industrial control computer through the communication management unit. The industrial control computer analyzes the fault data of the feeder bus current increment protection and provides relevant prompts for the feeder bus current increment protection based on the analysis results, and displays the fault waveform of the feeder bus current increment protection.

8. The control method for the DC traction power supply system training platform according to claim 5, characterized in that: When the equipment in the DC traction power supply system is a DC negative switch cabinet, and the fault simulation command is the fifth fault simulation command, the control method includes the following steps: The industrial control computer generates a fifth control signal based on the fifth fault simulation instruction; The analog signal generator generates a fifth fault analog signal under the control of the fifth control signal, and inputs the fifth fault analog signal to the voltage protection isolation transmitter of the DC negative pole cabinet; The relay protection device of the DC negative pole cabinet determines whether the frame voltage alarm or trip protection requirements are met. When the frame voltage alarm or trip protection requirements are met, the relay protection device of the DC negative pole cabinet starts fault recording and the frame voltage alarm or trip protection occurs. The relay protection device of the DC negative electrode cabinet transmits frame voltage alarm and trip protection fault data to the industrial control computer through the communication management unit; The industrial control computer analyzes the frame voltage alarm and trip protection fault data, and provides relevant prompts for frame voltage alarm and trip protection based on the analysis results, and displays the frame voltage alarm and trip protection fault waveforms; When the equipment in the DC traction power supply system is a DC negative switch cabinet, and the fault simulation command is the sixth fault simulation command, the control method includes the following steps: The industrial control computer generates a sixth control signal based on the sixth fault simulation command; The analog signal generator generates a sixth fault analog signal under the control of the sixth control signal, and inputs the sixth fault analog signal to the current protection isolation transmitter of the DC negative pole cabinet. The relay protection device of the DC negative pole cabinet determines whether the frame current trip protection requirement is met. When the frame current trip protection requirement is met, the relay protection device of the DC negative pole cabinet starts fault recording and the frame current trip protection occurs. The relay protection device of the DC negative electrode cabinet transmits the frame current trip protection fault data to the industrial control computer through the communication management unit; The industrial control computer analyzes the frame current trip protection fault data, and provides relevant prompts for frame current trip protection based on the analysis results, and displays the frame current trip protection fault waveform.

9. The control method for the DC traction power supply system training platform according to claim 5, characterized in that: When the equipment in the DC traction power supply system is a rail potential limiting device, and the fault simulation command is the seventh fault simulation command, the control method includes the following steps: The industrial control computer generates a seventh control signal based on the seventh fault simulation instruction; The analog signal generator generates a seventh fault analog signal under the control of the seventh control signal, and inputs the seventh fault analog signal to the current protection isolation transmitter of the rail potential limiting device. The relay protection device of the rail potential limiting device determines whether the requirements for the occurrence of voltage protection in stages I and II are met. When the requirements for the occurrence of voltage protection in stages I and II are met, the relay protection device of the rail potential limiting device starts fault recording and the voltage protection in stages I and II occurs. The relay protection device of the rail potential limiting device transmits the voltage protection fault data of sections I and II to the industrial control computer through the communication management unit. The industrial control computer analyzes the fault data of voltage protection in stages I and II, and provides relevant prompts for voltage protection in stages I and II based on the analysis results, and displays the fault waveforms of voltage protection in stages I and II.

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